Eyelash glue cures through a chemical reaction triggered by moisture in the air. The higher the humidity, the faster the glue dries. Conversely, in lower humidity environments, the curing process slows down.

To ensure reliable performance even in low humidity conditions,  low-humidity adhesives are formulated with trace catalytic agents that help accelerate curing. This is the key difference between low-humidity adhesives and standard formulas.

Generally, low humidity refers to a range of 25%–45%.  Adhesives are effective in a wider humidity levels, just the higher the humidity, the faster the glue will cure.

 

The Curing Mechanism of Eyelash Extension Adhesives

Eyelash extension adhesives are typically based on cyanoacrylate monomers, a class of fast-curing acrylate esters known for their strong adhesion and rapid polymerization. The curing process is fundamentally a moisture-triggered chain reaction, which can be described as follows:

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1. Chemical Composition and Reactive Nature

The primary component of lash adhesives is cyanoacrylate (CA), most commonly ethyl cyanoacrylate or butyl cyanoacrylate. These monomers are stabilized in the liquid state by trace acidic inhibitors, which suppress premature polymerization during storage.

In the bottle, cyanoacrylate exists in a metastable equilibrium. Once exposed to moisture in the surrounding air or on the substrate (the natural eyelash), this stability is disrupted, and polymerization is initiated.

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2. Moisture-Initiated Anionic Polymerization

The polymerization mechanism of cyanoacrylates is typically anionic chain-growth polymerization, initiated by nucleophiles.

• Initiation:
  The trace amounts of water (H₂O) in the environment undergo auto-ionization, generating hydroxide ions (OH⁻). These anions attack the electron-deficient carbon atom of the cyanoacrylate double bond (activated by the electron-withdrawing cyano –CN and ester –COOR groups).

  CH₂=C(CN)COOR + OH⁻ \;\;\longrightarrow\;\; ⁻CH₂–C^•(CN)COOR

• Propagation:
  The reactive anionic site propagates rapidly, attacking additional cyanoacrylate monomers. This results in rapid chain growth, producing a linear polymer:

  $$⁻CH₂–C(CN)COOR \;+\; n\; CH₂=C(CN)COOR \;\;\longrightarrow\;\; (–CH₂–C(CN)COOR–)_{n+1}^−$$

• Termination:
  Termination occurs either through protonation (neutralization by acidic species) or by chain transfer reactions. In practice, the polymerization is extremely fast, often reaching full solidification in seconds.

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3. Influence of Humidity on Curing Kinetics

Because moisture provides the initiating hydroxide ions, relative humidity (RH) plays a crucial role in curing rate:

• High Humidity (>65% RH):
  Excess water vapor accelerates initiation, leading to overly rapid curing. Adhesive may partially cure before proper bonding occurs, causing weak adhesion, blooming (whitening due to side reactions), and stronger odor emission.

• Low Humidity (<40% RH):
  Insufficient water slows down initiation, delaying curing and reducing bonding efficiency. In such cases, specialized formulations with catalytic additives (low-humidity adhesives) or environmental humidification are recommended.

• Optimal Ranges:

  • Standard formulations: 40–65% RH

  • Low-humidity formulations: 25–45% RH

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4. Role of Surface Chemistry (pH Effects)

Besides environmental humidity, the surface pH of the substrate (eyelash or skin contact area) can significantly influence curing:

• Alkaline surfaces (higher pH): Provide more nucleophilic sites (OH⁻), accelerating polymerization.

• Acidic surfaces (lower pH): Neutralize anionic initiators, slowing the curing reaction.

This is why pre-treatment agents (primers) with mild alkalinity are sometimes applied to natural lashes, ensuring consistent curing kinetics.

👉 Practical Note: The effectiveness of lash primers depends on their pH. By testing the pH of a primer, one can determine whether it enhances curing (slightly alkaline, beneficial) or potentially has the opposite effect (too acidic, inhibitory).

 

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5. Practical Implications in Lash Application

• Fast curing is beneficial for efficient application but may reduce working time for the technician.

• Slow curing increases risk of poor bonding or lash slippage.

• Adhesive formulations are therefore engineered with stabilizers, plasticizers, and accelerators to balance curing speed, flexibility, and durability under varying environmental conditions.

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✅ In summary:
The curing of eyelash extension adhesives is governed by anionic chain polymerization of cyanoacrylate monomers, initiated by trace environmental moisture. Both humidity and substrate surface pH critically determine the curing kinetics, and adhesive formulations are carefully adjusted to optimize performance across different working environments.

 

✨ Tip for Checking Your Glue ✨
Once opened, glue cannot be returned or refunded — but don’t worry, it’s very easy to check its freshness before you open it!

Just give the sealed bottle a little shake:

• If you hear a clear, watery sound, your glue is nice and fresh.

• If the sound is thicker or less fluid, the glue may have started to age.

• Over time, adhesive naturally becomes more viscous, and the sound will turn softer and less fluid.

We recommend doing this quick “shake test” when you receive your order, so you know your glue is in perfect condition before using it. 💧

 

💡 Extra Advice: To keep your work at its best, we don’t recommend stocking too much glue at once. Just buy enough for about 1-2 months of use, then reorder when you need more — that way, you’ll always enjoy the freshest adhesive.

👉 Don’t forget: every bottle has its EXP date printed on the bottom, so you can easily check and rotate your stock!

💡 About Storage:
We store all adhesives in large batches at a low temperature (5–10°C) to keep them fresh. But once they arrive to you, storage conditions may be different — meaning the glue’s real shelf life can be shorter than the factory EXP date on the bottle.

👉 That’s also why we recommend: don’t stockpile too many bottles. Just buy enough for 1–2 months of use, then reorder — this way, you’ll always be working with fresh, reliable glue.

 

 

 

How to Store Your Lash Adhesive Correctly

1. Unopened Glue – Long-Term Storage

• Store in a cool, low-temperature environment (5–10°C / 41–50°F).

• This slows down the natural aging process of cyanoacrylate and keeps the glue fresh until you are ready to use it.

• This is how we store glue in bulk at our facility.

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2. Opened Glue – After First Use

• Once opened, do not return the bottle to cold storage.

• Moving glue between cold and warm environments causes condensation on the bottle walls (like a car windshield fogging up in winter).

• These tiny water droplets can trigger premature curing inside the bottle, making the glue thick or unusable.

• Instead, store opened glue at room temperature, ideally 15–20°C (59–68°F), in an air-conditioned or stable indoor environment.

• Use within 4–6 weeks after opening for best performance.

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3. Common Mistakes to Avoid

❌ Storing opened glue in the fridge → condensation and early curing.
❌ Leaving glue in direct sunlight or near heat sources → rapid aging.
❌ Stockpiling too many bottles → risk of expired or thickened glue.

👉 Best Practice: Buy only enough glue for 1–2 months of use, check the EXP date printed on the bottom of each bottle, and restock as needed. This ensures you always work with the freshest adhesive.

 

 

SuperHero Glue is for low to normal humidity.

• 0.5 to 1 Sec Drying Time
•  Retention: 7-8 weeks
•  Viscosity: Very Thin
•  Less fume
•  Color:  Black
•  Volume: 10ml or 5ml
• Natural and Soft.
• No turn white. 
• Perfect for eyelash extension
• Private Label Available
• For bulk wholesale Price Please Contact Us

For eyelash extension professional and Salon use only

Opened or used glue is not eligible for return or refund.

 

 

★ EXTRA STRONG — with our latest formula this eyelash extension glue has an incredible retention power

★ LONG RETENTION -- eyelash extensions lasting up to 7-8 weeks. Strongest bonding and longest retention period in the market. This lash extension glue is the best choice for advanced lash extension stylists.

★ FAST DRY TIME —0.5 to 1 seconds. This eyelash adhesive has been designed for highly skilled lash artists, with fast dry time adding to speed of eyelash extension procedures. It works just as well in high humidity (RH 30-70%)

★ NO LATEX  -- We protect you and your clients by providing products of only the highest premium quality

★ SEALED PACKAGE and GLUE NEEDLE — we take care of our clients, having packed the YL Lash Extra Strong eyelash extension glue in a special sealed package with silica gel and  glue needle inside to preserve maximum glue freshness before it is opened and significantly extend the life of adhesive after bottle opening (up to 2 months)

★ The mission of the YL Lash brand is to provide the eyelash extension experts with superior quality and premium grade materials to give ultimate highlight to the beauty of the eyes of your clients. your clients will love it and keep coming back! We have strict quality control and regular review systems to provide you the best reliable and quality eyelash extension products.

★ SERVICE -- Your messages are always answered within 24hours.

★ Free Sample Available --- We provide 2ml sample sometimes But it run so fast so Check our website see if there was available. 

★ Private Label Available -- Create your own brand very easy !! Put your name or your store name on your products to boost your business.

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 Legal Disclaimer:

★ SAFETY WARNING: 

The glue can bond skin and eyes in seconds. Avoid contact with eyes and skin. Keep of the reach of children and pets.

Do not dispense or shake the glue near face or hair, do not put the nozzle of bottle toward anyone's face.

For professional eyelash extension use only.

For external use only. The glue must only be used by trained and certified and insured eyelash technicians. 

DO NOT USE THIS PRODUCT FOR SELF APPLICATION!! IT MAY CAUSE EYE IRRITATION AND BURNING.

★ FOR PROFESSIONAL USE ONLY

★ Clients must keep their eyes closed throughout the entire application process

★ The adhesive should never have contact with client's skin and eyes. Make sure the glue does not contact with eyelids.

★ Never try to apply eyelash extensions by yourself

★ Seller is not responsible for any misuse of glue. Buyer understands that for a private label order, all products are unlabeled, and buyer need to properly label products before resale.

★ EYE Contact - Immediately flush eyes with running water for at least 15 minutes

★ If redness, itching or a burning sensation develops, see a physician immediately!!

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BEST QUALITY EVER

 

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Best quality glue must have the Europe REACH test report.

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